Answer:
certain words and or sentences can affect the reader because the reader is so deep into the story that they end up getting their own emotions confused with it as they are reading. The brain is entirely focused on the words being written, so that leaves more room for the story to play with the reader's emotions. Certain words as in terrifying, horrifying, and traumatized, can Weevil reader understanding that a person in the story, or them, is feeling fear. Other words such as beaming, happy, and bright, give the reader a more positive outlook on the emotions that they are feeling and the book. The Narrative can differ from a theme by stating different conflicts that the characters are in, and stating how they are feeling. A thing does not have to apply to every single sentence in the book, but it should still be used as a main idea throughout the entire writing process.
A microscope, I hope this helps you :)
It is known as "Thematic Development".
